What is the sum of all angles in a triangle?
- 10°
- 20°
- 180°
- 220°
Explanation
- The sum of the three interior angles of a triangle is 180°.
- This rule applies to all types of triangles.
- If two angles are known, the third angle = 180° − (sum of the other two angles).
- It is a basic rule of geometry.
- This property is known as the Angle Sum Property.
Last updated 17 july 2026 by NA
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